Avalanche Forecast
Issued: Feb 13th, 2013 9:35AM
The alpine rating is Wind Slabs, Storm Slabs and Persistent Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Fair - Timing or intensity of solar radiation is uncertain on Thursday
Weather Forecast
Overnight and Thursday: Mostly clear with cold temperatures overnight and nil precipitation. Moderate Westerly winds are expected to decrease to light Northwesterly by morning. Freezing levels down to the valley bottom overnight, and then rising up to about 1100 metres during the day. Some light precipitation may start by evening.Friday: Moderate West winds with Alpine temperatures around -6.0 and freezing levels rising to around 1200 metres. High overcast becoming cloudy with flurries starting in the evening. Saturday: Flurries becoming light snow overnight. Expect 5-10 cms during the day.
Avalanche Summary
Natural avalanches up to size 2.5 were reported from various aspects. Avalanches were reported to be dry slabs, and mostly from steep unskiable terrain.
Snowpack Summary
There is a new soft slab that is 20-40 cms thick that is sitting on a new layer of surface hoar that was buried on February 12th. This soft slab is expected to be reactive to light additional loads and may result in avalanches up to size 2.0. Before this new slab developed, there were various surfaces that consisted of wind slab in exposed lee alpine terrain, sun crust on solar aspects, and surface hoar or facets on shady slopes. Below this up to 40 cm of settled storm snow sits on old wind slabs and recently buried weak layers. The late January surface hoar, sun crust, and/or facet layer is down around 80 cm deep and remains a concern for triggering. Use extra caution on large open slopes, cutblocks and convex rolls at and below treeline where the buried surface hoar may be preserved.Cornices are reported to be large throughout the region. The mid-pack is generally well settled and strong and the average snowpack depth at treeline elevations is near 200 cm.
Problems
Wind Slabs
Aspects: North, North East, East, South East, South.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Storm Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Persistent Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Feb 14th, 2013 2:00PM